samba - Oct 2006 - samba problem

Hello.

I'm using samba as my PDC. My version is samba-3.0.21b-2 with Fedora Core 5.

I having alot of problems specially with windows 98 stations. I have a
program hosted on samba that's uses DBF database and aparently the system
freeze and stop to working on stations. I see in logs this information when
the system freeze: closed connection to service sys

My smb.conf

[global]
   workgroup = DORIGON
   netbios name = SRV
   server string = srv
   smb ports = 139
   printcap name = /etc/printcap
   load printers = yes
  cups options = raw
guest account = nobody
  log file = /var/log/samba/%m.log
   max log size = 50
   security = user
encrypt passwords = yes
  unix password sync = Yes
  passwd program = /usr/bin/passwd %u

  passwd chat = *New*UNIX*password* %n\n *ReType*new*UNIX*password* %n\n
*passwd:*all*authentication*tokens*updated*successfully*
   socket options = TCP_NODELAY IPTOS_LOWDELAY SO_SNDBUF=8192 SO_RCVBUF=8192
   interfaces =  eth1
local master = yes
   os level = 100
domain master = yes
   preferred master = yes
domain logons = yes
 logon script = dorigon.bat
   logon path = \\%L\Profiles\%U
   wins support = yes
dns proxy = no

[homes]
   comment = Pastas dos Usuarios
   public= no
   browseable = no
   writable = yes

[IPC$]
    path = /home/tmp
    guest ok = yes
    valid users     hosts allow 
[netlogon]
   comment = Compartilhamento de Scripts
   path = /home/netlogon
   guest ok = yes
   writable = yes
   share modes = no
   public= no
   browseable = no

[Profiles]
    path = /home/profiles
    browseable = no
    writeable = yes
    create mask = 0600
    read only = no
    directory mask = 0700

[sys]
    comment     path = /home/sys
    public = yes
    browseable = yes
    writable = yes
    locking = no
    printable = no
    valid users= @dorigon
    force create mode = 0777
    force directory mode = 0777

Hi, 
I'm a System Administrator of a little bank in Catalonia(Spain). 
I visit your web ( http://www.samba.org) to look for information about a problem
with shared resources between hosts.
Our problem is:
    We want to share directories of the "production hosts" into the
"developer hosts".
    The hosts are HPUX 11.11, and we have the version A.02.01 of the CIFS
Client, and A.02.01.01 for the Server.
    We have directories in Production hosts with 'root' user, and we
want to do that other users(not Administrators/root) in the "developer
hosts" could see the content of this directories, only for reading.
Also, we want to restrict by group (unix) the acces to this mount points in the
developer hosts
The problem is that in the production hosts not exists the users/groups of the
developer hosts.

A practical example:

 Client Host (developers)
  group1: user1, user2, user3
  group2: user5, user 6, user1
  /Mountpoint1/ is a mount point of the shared_dir1 => only
visible/accessible for the users of group1
  /Mountpoint2/ is a mount point of the shared_dir2 => only
visible/accessible for the users of group2.

 Server Host (Production)
  root
  admin1: /Shared_dir1
  admin2: /Shared_dir2

Could you send us the basics steps to resolve our problem?

Thanks!!